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Allegro Allegro is multi-platform game programming library for C/C++ developers distributed freely, that provides many functions for graphics, sounds, player input (keyboard, mouse and joystick) and timers. It also provides fixed and floating point mathematical functions, 3d functions, file management functions, compressed datafile and a GUI. It can also be used for other types of multimedia programming.

Alpy Alpy provides a Python binding to the C Allegro game programming library. This binding is mostly focused with providing a basic "raw" interface to the library, trying to preserve most of the Python API similar to the C version to ease the transition to C programmers.

Clanlib ClanLib is a medium level development kit. At its lowest level, it provides a platform independent way of dealing with display, sound, input, networking, files, threading, etc. Beyond that ClanLib builds a generic game development framework, giving you easy handling of resources, network object replication, graphical user interfaces (GUI) with theme support, game scripting and more. It lets game developers avoid lowlevel trivials like setting up a directdraw window, sound mixing, reading image files, etc. All those things are simplified into object oriented classes and function calls. ClanLib uses a resource system to keep track of images, fonts, samples and music. It supports Targa, PCX, JPEG, PNG and BMP for images; wave files for sample; and Ogg Vorbis and MikMod for music. The resource system separates physical data formats from your code, and makes it easy to make themes and other plugins for your game. All classes in clanlib focus on making simple interfaces that are customizeable and expandable. This keeps your game code clean and simple, but still lets you to do advanced work. ClanLib is object oriented, which lets you operate at both high and low levels, minimizing redundant code but still letting you do things not supported by clanlib's high level APIs.

GGZ Gaming Zone The GGZ Gaming Zone develops a free gaming environment, based on a client-server architecture. More than 20 games are already available directly from the project, and integration into the major free desktops like KDE and GNOME is also being done. Player privacy, lack of advertisements and source code availability for game routine verification make this project a reliable platform for free games. Several independent game projects do already support playing over GGZ.

Invasores 'Invasores' was originally designed as a proof of concept of which language is fastest for developing games. After that, people started using it just for fun, and development continues this way. It should evolve into a game engine for simple games, probably for kids.

Libgaudio Libgaudio is a C/C++ library to facilitate easy incorporation of sound and sound effects into games. Samples are loaded into memory and playback is then triggered or stopped. The system mixes any number of concurrently playing samples together (up to a predefined maximum). It is also possible to include a background MP3 soundfile in the mix.

Plib PLIB is a set of libraries to write games and other realtime interactive applications that are 100% portable across a wide range of hardware and operating systems. It's used by Majik3D, FlightGear, and others, and includes libraries for GUI widgets, sound replay, geometry, scene graph, joystick, and fonts/text. The package also includes a scripting language and networking code, both focused towards games.

PySoy PySoy is a multi-threaded 3d game engine for Python. It's object-oriented API is designed for rapid game development while speed critical functions, such as physics processing and rendering, are implemented in C. (examples) With the most computation-heavy parts of OpenGL and Physics processing in C, PySoy remains efficient while offering a high level object-oriented Python API. The goal is to allow for rapid development without sacrificing speed or flexibility. Built primarily for games, PySoy offers an intuitive API for managing object behavior in 3D space. An optimized background thread takes care of the low-level processing leaving your Python code free to focus on higher level processing.

SDL SDL is a library that allows you portable low-level access to a video framebuffer, audio output, mouse, and keyboard. With SDL, it is easy to write portable games for various operating systems.

Sirikata Sirikata is a platform for virtual worlds. We provide a set of libraries and protocols which can be used to deploy a virtual world, as well as fully featured sample implementations of services for hosting and deploying these worlds.